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MARKETABLE SECURITIES - Securities in Continuous Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Gross Unrealized Losses |  |
Less Than 12 Months | $ (25) | $ (638)
12 Months or Longer | (2,487) | (6,459)
Total | (2,512) | (7,097)
Estimated Fair Value |  |
Less Than 12 Months | 2,920 | 29,860
12 Months or Longer | 156,758 | 191,232
Total | 159,678 | 221,092
Gross Unrealized Losses |  |
Less Than 12 Months | (4) | (561)
12 Months or Longer | (574) | (1,061)
Total | (578) | (1,622)
Estimated Fair Value |  |
Less Than 12 Months | 1,550 | 59,442
12 Months or Longer | 36,701 | 38,828
Total | 38,251 | 98,270
Corporate bonds |  |
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | (453)
12 Months or Longer | (27) | (336)
Total | (27) | (789)
Estimated Fair Value |  |
Less Than 12 Months | 0 | 11,236
12 Months or Longer | 5,013 | 7,718
Total | 5,013 | 18,954
Mortgage-backed securities |  |
Gross Unrealized Losses |  |
Less Than 12 Months | (24) | (89)
12 Months or Longer | (1,821) | (3,587)
Total | (1,845) | (3,676)
Estimated Fair Value |  |
Less Than 12 Months | 2,538 | 7,173
12 Months or Longer | 72,062 | 76,717
Total | 74,600 | 83,890
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | (21)
12 Months or Longer | (313) | (479)
Total | (313) | (500)
Estimated Fair Value |  |
Less Than 12 Months | 0 | 1,478
12 Months or Longer | 12,062 | 12,317
Total | 12,062 | 13,795
Collateralized mortgage obligations |  |
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | (79)
12 Months or Longer | (579) | (2,293)
Total | (579) | (2,372)
Estimated Fair Value |  |
Less Than 12 Months | 0 | 9,232
12 Months or Longer | 72,116 | 99,390
Total | 72,116 | 108,622
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | (28)
12 Months or Longer | (11) | 0
Total | (11) | (28)
Estimated Fair Value |  |
Less Than 12 Months | 0 | 2,171
12 Months or Longer | 2,026 | 0
Total | 2,026 | 2,171
Municipal securities |  |
Gross Unrealized Losses |  |
Less Than 12 Months | (1) | (17)
12 Months or Longer | (60) | (243)
Total | (61) | (260)
Estimated Fair Value |  |
Less Than 12 Months | 382 | 2,219
12 Months or Longer | 7,567 | 7,407
Total | 7,949 | 9,626
Gross Unrealized Losses |  |
Less Than 12 Months | (4) | (512)
12 Months or Longer | (250) | (582)
Total | (254) | (1,094)
Estimated Fair Value |  |
Less Than 12 Months | 1,550 | 55,793
12 Months or Longer | 22,613 | 26,511
Total | $ 24,163 | $ 82,304

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